Thanks!
https://github.com/electron/electron/releases https://github.com/electron/electron/releases/download/v3.0.0-beta.8/chromedriver-v3.0.0-beta.8-linux-armv7l.zip alas no arm64 but arm7 releases are possible. darwin , now sure if compat with gentoo bsd..
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=1fdf028d71b005a0cb2259c4a7b93c6dbf1e098a